What is the purpose of shielding in electrical wires?

The purpose of shielding in electrical wires is primarily to protect the wire against electromagnetic interference (EMI). Shielding involves the use of a conductive material, such as foil or braided copper, wrapped around the wire. This conductive layer acts as a barrier, absorbing and redirecting unwanted electromagnetic signals or noise that could disrupt the function of the wire or the signals it carries. This is particularly important in environments where multiple electrical devices are present, as they can generate significant interference that would compromise the performance of sensitive electrical systems or communication cables.

The use of shielding helps to ensure signal integrity and reduces the likelihood of erroneous readings or communications. In applications such as audio, video, and data transmission, effective shielding is crucial for maintaining clear and accurate signals free from external disturbances.